Congressional Code of Military Criminal Law applicable to all military members worldwide
http://www.au.af.mil/au/awc/awcgate/ucmj2.htm#925.%20ART.%20125.%20SODOMY
925. ART. 125. SODOMY
(a) Any person subject to this chapter who engages in unnatural carnal copulation with another person of the same or opposite sex or with an animal is guilty of sodomy. Penetration , however slight, is sufficient to complete the offense.
That article code is effectively dead letter after Lawrence V. Texas.